js数组常用的方法例子-结果在下方

来源：互联网发布：加湿器美工工资高吗编辑：程序博客网时间：2024/05/23 19:17
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html>  <head>    <title>test_array.html</title>    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">    <meta http-equiv="description" content="this is my page">    <meta http-equiv="content-type" content="text/html; charset=UTF-8">        <!--<link rel="stylesheet" type="text/css" href="./styles.css">--><script type="text/javascript">//合并数组var arr = new Array(3)arr[0] = "George"arr[1] = "John"arr[2] = "Thomas"var arr2 = new Array(3)arr2[0] = "James"arr2[1] = "Adrew"arr2[2] = "Martin"document.write("1.合并数组"+arr.concat(arr2))document.write("<br/>")//数组连接 var arr = new Array(3);arr[0] = "George"arr[1] = "John"arr[2] = "Thomas"document.write("2.数组连接 "+arr.join(","));//结果：George,John,Thomas document.write("<br/>")//数组排序var arr = new Array(6)arr[0] = "George"arr[1] = "John"arr[2] = "Thomas"arr[3] = "James"arr[4] = "Adrew"arr[5] = "Martin"document.write("3.数组连接 "+arr.sort())//结果：Adrew,George,James,John,Martin,Thomasdocument.write("<br/>")//pop 删除并返回数组的最后一个元素var arr4 = new Array()arr4[0] = "George"arr4[1] = "John"arr4[2] = "Thomas"arr4[3] = "James"arr4[4] = "Adrew"document.write("4.pop操作前 "+arr4.join())var last = arr4.pop();document.write("<br/>")document.write("pop操作后 "+arr4.join())document.write("<br/>")//push 向数组的末尾添加一个或更多元素，并返回新的长度var arr4 = new Array()arr4[0] = "George"arr4[1] = "John"arr4[2] = "Thomas"document.write("5.push操作前 "+arr4.join())var size = arr4.push("Adrew","hello","ds");document.write("<br/>")document.write("push操作后 "+arr4.join())document.write("<br/>")//颠倒数组中元素的顺序。var arr4 = new Array()arr4[0] = "George"arr4[1] = "John"arr4[2] = "Thomas"document.write("6.reverse()操作前 "+arr4.join())var size = arr4.reverse();document.write("<br/>")document.write("reverse()操作后 "+arr4.join())document.write("<br/>")//删除并返回数组的第一个元素var arr4 = new Array()arr4[0] = "George"arr4[1] = "John"arr4[2] = "Thomas"document.write("6.shift()操作前 "+arr4.join())var size = arr4.shift();document.write("<br/>")document.write("shift()操作后 "+arr4.join())document.write("<br/>")//从某个已有的数组返回选定的元素//http://www.w3school.com.cn/jsref/jsref_slice_array.aspvar arr4 = new Array()arr4[0] = "George"arr4[1] = "John"arr4[2] = "Thomas"arr4[3] = "James"arr4[4] = "Adrew"arr4[5] = "Martin"document.write("7.slice()操作前 "+arr4.join())var arr6 = arr4.slice(2,4);document.write("<br/>")document.write("slice()操作后的数组 "+arr6.join())document.write("<br/>")//删除元素，并向数组添加新元素。//http://www.w3school.com.cn/jsref/jsref_slice_array.aspvar arr4 = new Array()arr4[0] = "George"arr4[1] = "John"arr4[2] = "Thomas"arr4[3] = "James"arr4[4] = "Adrew"arr4[5] = "Martin"document.write("7.slice()操作前 "+arr4.join())var arr6 = arr4.slice(2,4);document.write("<br/>")document.write("slice()截取的数组 "+arr6.join())document.write("<br/>")/*执行结果：1.合并数组George,John,Thomas,James,Adrew,Martin2.数组连接 George,John,Thomas3.数组连接 Adrew,George,James,John,Martin,Thomas4.pop操作前 George,John,Thomas,James,Adrewpop操作后      George,John,Thomas,James5.push操作前 George,John,Thomaspush操作后      George,John,Thomas,Adrew,hello,ds6.reverse()操作前 George,John,Thomasreverse()操作后      Thomas,John,George6.shift()操作前 George,John,Thomasshift()操作后      John,Thomas7.slice()操作前           George,John,Thomas,James,Adrew,Martinslice()操作后的数组 Thomas,James7.slice()操作前     George,John,Thomas,James,Adrew,Martinslice()截取的数组 Thomas,James*/</script>  </head>    <body>  </body></html>
0 0